Travel mug



FIG. 1 is a top perspective view of a travel mug showing a new design;

FIG. 2 is a top plan view thereof;

FIG. 3 is an elevational view thereof; and,

FIG. 4 is a bottom view thereof.

The broken lines shown on FIG. 1 are for illustrative purposes only and form no part of the claimed design. 

The ornamental design for a travel mug, as shown and described. 